Oxyacetylene welding or cutting equipment



Jan. 14, 1947. H., A. E. TALLEY 2,414,345

OXY-ACETYLENE WELDING OR CUTTING EQUIPMENT Filed Nov. 27, 1943 Patented Jan. 14, 1947 OXYACETYLENE R CUTTING EQUIPMENT Henry Alfred'Ernest Talley, London, England, as-.

signor to Medical & IndustrialEquipment.Limited, London, England Application November 27, 1943,- .Serial No. 512,072: In. Great Britain March i, 1943i Claims.

llhis invention relates to cXy-acetylene Welding and cutting apparatus its object being to provide a novel construction of apparatu which will en sure economy and provide greater efiiciency with unskilled operators, such construction consisting mainly in controlling the supply of one of the gases by a sensitive demand regulator, the diaphragm of which is actuated under the influence of the suction caused by the flow of the gases through a jet and restricted tube towards the burner jet.

A further feature of the invention consists in theassociation with the oxygen and acetylene gas supplies of fine. adjustment control means by which further regulation of the supply of the gases can be calibrated to provide automatic action.

It is thus possible to obtain a constant and correct flame at the burner jet by controlling the gas pressures and providing suitable jet orifices for the oxygen and the final burner nozzle.

So that the'invention may be fully understood and readily carried into effect I will now describe the same, reference being had to the accompanying drawing which-showsby way of simple diagrammatic illustration two forms of construction wherein:

Figure 1 is apart vertical elevation of the apparatus using fine adjustment controls onlboth the oxygen and the acetylene gas supplies; Fig. 2 is a part vertical section of a, simplified construction of more practical nature which dispenses with the fine adjustment valves. Fig. 3 is an enlarged detail sectional view illustrating the mannerof mounting the diaphragmractuated levers.

In the construction shown at Fig. 1 acetylene gas from the usual cylinder or other source of supply A passes to a fine adjustment control de vice B which is shown, described, and claimed in my co-pending application filed March 31, 1944,

Serial No. 528,828; and which has now become Patent No. 2,384,354, granted September 4, 1945, (any usual regulator cock such as i being included if desired) thence to the restrictedtube C and to the burner nozzle at D: The oxygen supply from a cylinder E or other supply passes to a sensitivedemand' regulator F (an ordinary rogu lator I* being interposed if desired), thence to a second fine adjustment control device B and to the oxygen jet 0* within the restricted tube C where it admixes with the acetylene gas and passes to the burner nozzle D. Negative pressure occurs at the point where the oxygen jet meets the restricted tube.

The sensitive demand regulator F is of the kind described in my co-pending application Serial-No.

523,229, filed March3l, 1944, and consistsof a.

casing in which is secured a resilientor flexible diaphragm M, the casing having anrextension Hi to which the oxygen supply is connectedat it; the end of such extensionbeing closed, if. desired; by a plug IT. A valve seat i 8 is located in, theexe tension and adapted to-be normally closed by a valve. I9 whose stemor spindle 20. is pressed by. a

headed pin or flanged neck 2i attaohed-tothe junction point 22a of two or more levers 22 fulcrumed intermediate-their. ends in thecasin ofthe diaphragm iii and engaged by their free ends with l the diaphragm itself- The leversl 2,2. which are. disposed radially with relation. to the; casing 24a have innerand outer arms the innerarms 23 and will" withdraw the valve I9. fromits seat. 18 and willpermit oxygen; from the cylinder E to pass through the extension Hi to thesecond fine adjustmentcontrol; Thediaphragmis open tolthe atmosphereiat 24,-

Obviously. the acetylenegas supply may be taken to the sensitive demand regulator F instead of the'oxygen.

The fine adjustment valves areadjusted'sothat theamount of gas allowed to pass through the outlet i is predetermined andconstant. Thesis fect'of the diaphragm isthat bY IIIaIISOffB4 negative-pressure being appliedlto it, it-opensa valve:

to admit gas to the restricted tube.

In the construction shown at Fig. 2;. which adjustment valvesare dispensed with andthe ap plication filedlMarch 31,1944, Serial Normans.

thesame-principle is:involved except that the fine.

adjustment valves are dispensed withand the apparatus generally given a-more practicalform;

The: acetylene and' oxygen from the usual sources ofsupply. are connectedrespectively to.

I the unions or sockets 25; 26. whichconne-ct with passages housedor formed in a handle portion 21- terminatingine; chamber The oxygensupply passes by a passage 28 shown dotted, in the pe- The valve opening 3| is normally closed by a valve 35 sealed from the atmosphere whose stem 38 rests in a recess 37 of a pin or neck 38 carried by a plate 39 to which are afiixed the ends of two or more levers 40 fulcrumeol at 4| to the casing of a sensitive demand regulator 44 embodying a diaphragm 43 on which the free ends 42 of the levers 49 bear. The casing has an opening at 45 so that the diaphragm 43 is subjected to atmospheric pressure on that side. Furthermore a passage 46 is provided between the diaphragm 43 and the outlet 32.

The pressures of the gases are suitably regulated as for example oxygen" at 30 lbs. per square inch, and acetylene at 60 lbs. per square inch and the jets are similarly selected as for example 70 amal for the oxygen and 250 amal for the burner nozzle jet which means that the orifices are of a size respectively to allow gas to flow at the rate of '70 and 250 cc. per minute at a pressur equal to six inches of water; in this manner a constant and correct welding or cutting flame can'be obtained without risk of explosion so that it is possible for unskilled labour to use the apparatus effectively.

The suction created by the flow of the oxygen causing a negative pressure at the mouth of jet 29 in Venturi tube 34 willforce the diaphragm 43 to act on the levers 43 so bringing about the movement of a pin 38 against the action of its spring 41 to open the valve 35 and permit the flow of acetylene to the Venturi tube 33.

I claim: V

1. Oxy-acetylen cutting and welding apparatus 'comprisinga welding tube including a jet and a tube surrounding the jet and having a restricted area adapted to cooperate with the jet to produce sub-atmospheric pressure, a, supply of oxygen gas, a fine adjustment control therefor, a supply of acetylene gas, a, sensitive demand regulator, a passage from the supply of acetylene gas to the sensitive demand regulator, said sensitive demand regulator including a diaphragm having one of its faces subjected to atmospheric pressure and positively actuated by the same when its other face is subjected to sub-atmospheric pressure,a valve sealed from the atmosphere and interposed in the acetylene gas passage and controlled by said diaphragm to open when the diaphragm is subjected to said sub-atmospheric pressure, the sensitive demand regulator being provided with an outlet, a

second fine adjustment control connected to the handle provided with sockets, a supply of oxygen gas connected with one of the sockets, a supply of acetylene gas connected with the other socket,

a chamber provided on the handle and having a 4 for creating a sub-atmospheric pressure within the tube at the mouth of the jet, a conduit between the socket for the acetylene gas and an inlet to said chamber, a conduit from an outlet of said chamber to the tube, a, valve sealed from the atmosphere and interposed between the inlet and outlet of said chamber for the acetylene gas, and diaphragm actuated means including a diaphragm having one of its faces subjected to atmospheric pressure and positively actuated by the same when its other face is subjected to subatmospheric pressure, whereby the valve will be actuated by the diaphragm and opened when the diaphragm is actuated by atmospheric pressure. 3. Oxy-acetylene cutting and welding apparatus as claimed in claim 2 having a diaphragm actuated means comprising a casing fast to one end of the chamber, a flexible diaphragm therein, levers iulcrumed intermediate of their ends to said casing and hearing at one end on the diaphragm, a spring pressed plate connected to the other end of said levers, and a headed pin on said plate adapted to move within the chamber and contact with the valve therein.

4. Oxy-acetylene cutting and welding apparatus comprising a jet, a tube surrounding said jet and having a restricted area adapted to cooperate with the jet to produce sub-atmospheric pressure, a supply of oxygen gas, a supply of acetylene gas, means for ensuring constant flow of said gases to the jet and the tube including conduits for said gases, the flow of gas through the jet creating a sub-atmospheric pressure within the tube at the mouth of the jet, and a diaphragm controlled 'valve sealed from the atmosphere and interposed in one of the conduits and including a diaphragm having one of its faces subjected to atmospheric pressure and positively actuated by the same when its other face is subjected to sub-atmos pheric pressure, and a valve operatively connected with said diaphragm and opened by the same when the diaphragm is actuated by atmospheric pressure,

5. Oxy-acetylene cutting and welding apparatus comprising a welding tube including a jet and a tube surrounding the jet and having a restricted area adapted to cooperate with the jet to produce sub-atmospheric pressure, a, source of oxygen gas, a source of acetylene gas, a conduit conveying oxygen gas to said jet for creating a sub-atmospheric pressure in the tube at the mouth of the jet, another conduit conveying acetylene gas is set up at the mouth of the restricted arc of the welding tube when gas flows through said jet, and a valve sealed from the atmosphere and interposed in the other conduit and controlled by the diaphragm for opening the valve when the diaphragm is subjected to said sub-atmospheric pressure HENRY ALFRED ERNEST TALLEY. 

